It is noticed that oleanane triterpenoidal saponins are characteristic constituents of this family and have taxonomic significance.
结果墩果烷型三萜皂甙作为木通科的特征化学成分在该科的统分类中具有一定的意义。
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One theory holds that, if Rhyniognatha was a flying insect, that would mean that the pterygotes -- the taxonomic group that includes flying insects -- first came about in the early Devonian, say, more than 400 million years ago.
一种理论认为, 如果鼻颚龙是一种飞行昆虫,那就意味着翼龙——包飞行昆虫在内分类群——首先出现于泥盆纪早期,比方说,4 亿多年前。